I went back to try getting closer, focal length wise. Got a little closer, but it was very cold & very windy with very strong gusts of wind so the owlets did not show themselves much. Used a 400mm lens and a Canon 7D (1.6X crop body) with teleconverters. With the 1.4X teleconverter, it equaled approx. 896mm equivalent on a full frame body or with the 2X teleconverter – it equaled approx 1280mm equivalent on a full frame body. But it helped in getting my subjects closer. These are still cropped in some, but not as much as the 1st set.